表面活性剂-模板化溶胶-凝胶法制备核燃料结构类似物ThO2

S. Darzi, N. Mohseni
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引用次数: 2

摘要

表面活性剂模板纳米结构陶瓷材料的溶胶-凝胶合成通常是通过在聚合物胶束存在下对起始材料进行控制的水解和缩合,然后通过萃取或煅烧将其去除来进行的。本文采用表面活性剂模板溶胶-凝胶法,以硝酸钍和辛烷基酚聚氧乙酸酯聚合物为结构导向剂合成了二氧化钍凝胶,并对制备的二氧化钍粉末(ThO2- s)与商品二氧化钍粉末(ThO2- c)的烧结性能进行了比较。制备的ThO2-S由微孔和介孔组成,其比表面积高达31.23 m2/g,粒径为15.1 nm。将生产的粉末ThO2- s进行压制和烧结,形成高密度的ThO2球团。颗粒的最终粒度达到微米以下。利用扫描电镜对制备的球团的生坯密度和烧结密度进行了计算,并对其微观结构特征进行了研究,结果表明,该合成路线制备的二氧化钛纳米粉体具有良好的低温烧结性能。在“Ar”和“Ar-8% h2”气氛下烧结制备的ThO2- s样品和商品ThO2样品,并将两种气氛下在1500℃下烧结的数据进行比较,结果表明气氛对密度值没有影响。此外,th2 - s球团的绿色密度小于th2 - c,但由th2 - s制备的球团比由th2 - c制备的球团达到了更好的烧结密度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preparation of ThO2 as a structural analogue for nuclear fuel via surfactant-templated sol-gel route
Sol-gel synthesis of surfactant-templated nanostructured ceramic materials is usually carried out via controlled hydrolysis and condensation of a starting material in the presence of micelles of a polymer, followed by its removal by extraction or calcination. In this work, surfactant template sol-gel route for the synthesis of thorium dioxide gels using thorium nitrate and octyl phenol ethoxylate polymer as a structure directing agent was described, and the sinterability of the produced ThO2 powder (ThO2-S) was investigated in comparison with commercial one (ThO2-C). Prepared ThO2-S composed of micro and meso pores and exhibited high surface area as 31.23 m2/g and particle size as 15.1 nm. The produced powder ThO2-S was pressed and sintered to form the high density ThO2 pellet. The final grain size of the pellets reached below micrometer size. The calculated green and sintered densities of the fabricated pellets, and their microstructural characteristics studies, utilizing SEM images, show that this synthesizing route yielded a good sinterability of the synthesized ThO2 nanopowder at low temperature. Prepared ThO2-S sample and commercial ThO2 were sintered under the atmospheres “Ar” and “Ar-8%H2, and comparison of data from samples sintered under the both of two different atmospheres at 1500 °C, show that the atmosphere had no effect on density value. Furthermore, the green density of ThO2-S pellets is less than ThO2-C but the pellets which were fabricated from the ThO2-S have reached better sintered density than the pellets fabricated by ThO2-C.
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